Panax trifolius vs Aralia nudicaulis

I received this one (AGS seed) as Panax trifolius, but it's beginning to look very much like Aralia nudicaulis which I have elsewhere (dark leaved plant in the foreground). It hasn't flowered. The picture is from last year and this year it's begun spreading vegetatively quite vigorously. Can the leaves easily be told apart?

It is also my understanding that Panax have palmately arranged leaflets; Aralia have pinnately arranged leaflets.

Good disgnostic point Rick, you can see the palmate leaf arragment of the Panax clearly in the Connecticut Botantical Society link, and the 3-5 pinnate leaf arrangement of the Aralia in the Wisconsin Plants link.

Thanks lads!! Not having much success with Panax! I planted seed propagated Panax quinquefolius; P. ginseng and what I thought was P. trifolius and only trifolius made it through the winter here... :'(

Stephen Barstow
Malvik, Norway
63.4N
Age: Lower end of the 20-25,000 day range